Tenable Announces Closing of Initial Public Offering and Full Exercise of Underwriters' Option to Purchase Additional Shares

COLUMBIA, Md., July 30, 2018

Morgan Stanley, J.P. Morgan, Allen & Company LLC and Deutsche Bank acted as active book-running managers for the offering. Stifel acted as passive book-running manager, and William Blair and BTIG acted as co-managers for the offering.

The offering was made only by means of a prospectus. A copy of the final prospectus may be obtained from Morgan Stanley & Co. LLC, Attention: Prospectus Department, 180 Varick Street, 2nd Floor, New York, New York 10014 or email at prospectus@morganstanley.com; J.P. Morgan Securities LLC, Attention: Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, telephone: 1-866- 803-9204, or email at prospectus-eq_fi@jpmchase.com; Allen & Company LLC, Attention: Prospectus Department, 711 Fifth Avenue, 10th Floor, New York, New York 10022, or by email at dweidlein@allenco.com; or Deutsche Bank Securities Inc., Attention: Prospectus Group, 60 Wall Street, New York, New York 10005.

A registration statement relating to these securities has been filed with, and declared effective by, the Securities and Exchange Commission. This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Tenable

Tenable® is the Cyber Exposure company. Over 24,000 organizations around the globe rely on Tenable to understand and reduce cyber risk. As the creator of Nessus®, Tenable extended its expertise in vulnerabilities to deliver Tenable.io®, the world's first platform to see and secure any digital asset on any computing platform. Tenable customers include 53 percent of the Fortune 500, 29 percent of the Global 2000 and large government agencies.